arm64: dts: rockchip: describe I2c Bus 1 and IMX258 world camera on PinePhone Pro

Add the description of the rear/world camera (IMX258) on the PinePhone Pro
to the device dts file.
It receives commands on the I2C Bus 1 at address 0x1a and transmits data
over CSI-MIPI.

The I2C address for IMX258 can be found in the IMX258-0AQH5 Software
Reference Manual, page 24, section 2.3.1: 0b0011010 = 0x1a.
Section 3 indicates the module has 4 pairs of data lines. While 4-lane
mode is nominal, 2-lane mode should also be supported.

The pin muxing info was extracted from the PinePhone Pro schematic v1.0
as well as the RK3399 datasheet revision 1.8.

Table 2-3 in section 2.8 of the RK3399 datasheet contains the mapping
of IO functions for the SoC pins. Page 52 shows GPIO1_A0, page 54 shows
GPIO2_D4.

For I2C power, the PinePhone Pro schematic page 11 quadrants A4 and A5:
RK3399_J.AA8 and RK3399_J.Y8 get power from vcaa1v8_codec, so turn it on

The IMX258 also uses the following regulators, expected by its driver:
 - vana (2.8V analog), called AVDD2V8_DVP on P.18 q.C1 and derived from
   VCC1V8_S3 on P.13 q.B2
 - vdig (1.2V digital core), called DVDD_DVP on P.18 q.C1 and shown on
   P.18 q.D3 to be equivalent to VCC1V2_DVP derived from VCC3V3_SYS on
   P.13 q.B3. Note that this regulator's voltage is inconsistently
   labeled either 1.2V or 1.5V

RK3399_J.AG1 is GPIO4_A1/I2C1_SDA, RK3399_J.Y6 is GPIO4_A2/I2C1_SCL
This is the default pinctrl "i2c1_xfer" for i2c1 from rk3399-base.

For the reset (RESET) signal:
page 11 quadrant D2             | p.18 q.C3-4 | p.18 q.C2
RK3399_E.R25 -> GPIO1_A0 -> Camera_RST -> MIPI_RST0 -> IMX258.12

For the powerdown (PWDN) signal:
page 11 quadrants B4-5          | p.18 q.C2
RK3399_G.AF8 -> GPIO2_D4 -> DVP_PDN1_H -> IMX258.14

Helped-by: Dragan Simic <dsimic@manjaro.org>
Co-developed-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Olivier Benjamin <olivier.benjamin@bootlin.com>
Link: https://lore.kernel.org/r/20250620-camera-v4-3-0201a8ed5fae@bootlin.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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